Molder s facing



lUlllllEU ATES a'rnnr JOHN J. RIDDLE, OF MADISONVILLE, OHIO.

MOLDERS FACENG.

SPECIFICATION forming part of Letters Patent No. 335,628, dated February9, 1886.

Application filed July 2, 1884. Renewed July 10, 1885, Serial No.171,228. (No specimens.)

To (d6 whom it 'may concern:

Be it known that l, JOHN J. RIDDLE, of Madisonville, in the county ofHamilton and State of Ohio, have invented. certain new and usefulImprovements in Molders Facings, of which the following is aspecification.

My invention is amolders facing for molds made from sand or othersuitable material to have the configuration of any desired pat tern, forcasting molten metals, such as iron, copper, brass, zinc, or othermetals.

The desideratum of molders facings is to produce the castings with aperfect impression,witl1 as smooth a surface as possible, with the leastwork, and in the shortest period of time.

My facing is what molders term a onebag facing, needing neither lime asafoundation, nor any other material for the returnfacing.

Molders now use, in making fine castings, lime fora foundation, and fromtwo to five other different facing coats. lVith all this work and carethey cannot make as smooth and perfect castings as can be made with myone-bag facing herein described, for the rea son that my invention doesnot stick or blow off, or is not floated up, does not wash off by thepouring of the molten metal, and is notin the least burned into or tothe metal while in a liquid state.

By the use of this facing most of the surface of the metal castingscomes out of the sand mold very clean, leaving on the castings butlittle of the facing, and that adheres so slightly that it is easilybrushed off.

My molders facing is composed of very finely-divided si1ica,oxide ofcalcium or quick lime, magnesia or baryta, oxide of iron or manganese,(the black oxide or scsquioxide of iron or manganese being preferredJcharcoal, and soda or potash, (the carbonate being preferred.) I alsoadd common rosin, which has been made very deep in color and brittle,(in other words, rosin which has been converted into colophoric acid.)Its omission detracts but little from the usefulness of the facing. Ifind by repeated experiments that the materials mixed with thefinely-divided silica have a wide range of proportions, owing to thefact that the heated metal converts these materials into artificialplumbago, and com bine with the silica and lime to form the facing. Oneformula is as follows: one hundred parts offinely divided silica; oxideof iron, from five to thirty parts; oxide of calcium,orquicklime, fromfive to fifteen parts; charcoal, ten to one hundred parts, well mixed,with about onetenth as much soda or potash, with or without rosin inmoderate quantity. This makes a facing which causes the castings to bevery smooth and perfect. Hard or soft coal,well pulverized, may besuccessfully used instead of the charcoal and soda.

My preferred formulais: silica, finely divided, one hundred parts; blackmagnetic iron ore, blacksmiths scales, brown hematite iron ore,sesquioxide of manganese, or black oxide of manganese, one hundred toone hundred and fifty parts, (I generally use one hundred and eighteenparts;) charcoal, forty parts, combined with soda, four parts;quieklime, ten to fifteen parts, (I generally use fifteem) the whole tobe pulverized and thoroughly mixed by mechanical means. The silica,iron, charcoal, and quicklime have a Wide range of proportions, whichare entirely practical.

The essential parts of my facing are oxide of iron and silica. The otherparts are added as a finish. About one-half per cent. of rosin ispreferably added, to give the facing a good body and cause it to adhereto the sand under heat.

I claim 1. A n'iolding-facing consisting, essentially, ofsilica andoxide of iron, substantially as described.

2. A molding facing consisting of silica, oxide of iron, carbon, andquicklime, substantially as described.

3. A molding facing composed of silica, black oxide of iron, quicklime,charcoal, and soda, finely pulverized and mixed, substantially asdescribed.

4. A moldingfacing composed of silica, black oxide of iron, quicklime,rosin, charcoal,and soda,finely pulverized and mixed, substantially asdescribed.

In testimony whereof I have hereunto set my hand.

JOHN J. RIDDLE.

Witnesses:

J. S. RoEBUcK, Jr, ROBERT ZAHNER.

